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ETRA SOM/ETRA Hardware/Power and Reset/Power Supply Unit (PSU) and recommended power-up sequence

208 bytes added, 08:32, 31 December 2020
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[[File:ETRA-power-sequence.png | 800px]]
The PSUPMIC:
* generates the proper power-up sequence required by the SOC processor and surrounding memories and peripherals
* synchronizes the powering up of carrier board in order to prevent back power
=== Power-up sequence===
''TBDThe typical power-up sequence is the following: descrizione dei segnali che intervengono nella PS'# VIN_SOM main power supply rail is powered# PMIC initiates the powerup sequence needed by STM32MP1 SoC# VDD rail is powered and the SOM_PGOOD signal is asserted# PMIC deassert processor reset and check it's status
==== Note on SOM_PGOOD usage ====
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